From d1faf8b39cf9492d1cd6f2e26b916dce0fe0354f Mon Sep 17 00:00:00 2001
From: Bertrik Sikken <bertrik@sikken.nl>
Date: Fri, 12 Jun 2009 21:11:45 +0000
Subject: FS#10317 - Sansa AMS 32-bit timers. Configure the timers for 32-bit
 mode instead of the default 16-bit mode.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21266 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/timer.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

(limited to 'firmware/timer.c')

diff --git a/firmware/timer.c b/firmware/timer.c
index e9f11b6ae7..85e50ae3ca 100644
--- a/firmware/timer.c
+++ b/firmware/timer.c
@@ -109,23 +109,17 @@ void TIMER1_ISR(void)
 
 static bool timer_set(long cycles, bool start)
 {
-#if CONFIG_CPU == SH7034 || defined(CPU_COLDFIRE) || CONFIG_CPU == AS3525
+#if CONFIG_CPU == SH7034 || defined(CPU_COLDFIRE)
     int phi = 0; /* bits for the prescaler */
     int prescale = 1;
 
-#if CONFIG_CPU == SH7034 || defined(CPU_COLDFIRE)
-#define PRESCALE_STEP 1
-#else /* CONFIG_CPU == AS3525 */
-#define PRESCALE_STEP 4
-#endif
-
     while (cycles > 0x10000)
     {   /* work out the smallest prescaler that makes it fit */
-#if CONFIG_CPU == SH7034 || CONFIG_CPU == AS3525
+#if CONFIG_CPU == SH7034
         phi++;
 #endif
-        prescale <<= PRESCALE_STEP;
-        cycles >>= PRESCALE_STEP;
+        prescale <<= 1;
+        cycles >>= 1;
     }
 #endif
 
@@ -178,10 +172,6 @@ static bool timer_set(long cycles, bool start)
 
     return true;
 #elif CONFIG_CPU == AS3525
-    /* XXX: 32 bits cycles could be used */
-    if (prescale > 256 || cycles > 0x10000)
-        return false;
-
     if (start)
     {
         if (pfn_unregister != NULL)
@@ -193,8 +183,12 @@ static bool timer_set(long cycles, bool start)
 
     TIMER1_LOAD = TIMER1_BGLOAD = cycles;
     /* /!\ bit 4 (reserved) must not be modified
-     * periodic mode, interrupt enabled, 16 bits counter */
-    TIMER1_CONTROL = (TIMER1_CONTROL & (1<<4)) | 0xe0 | (phi<<2);
+     * periodic mode, interrupt enabled, no prescale, 32 bits counter */
+    TIMER1_CONTROL = (TIMER2_CONTROL & (1<<4)) |
+                     TIMER_ENABLE |
+                     TIMER_PERIODIC |
+                     TIMER_INT_ENABLE |
+                     TIMER_32_BIT;
     return true;
 #elif defined CPU_COLDFIRE
     if (prescale > 4096/CPUFREQ_MAX_MULT)
-- 
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